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Quantum Field Theory and Many Body Physics 2023

Prerecorded lecture Thursday, June 8:

Here is the link to the lecture. THE PASSWORD IS passwordpassword = TWICE THE USUAL PASSWORD WITHOUT ANY SPACES IN BETWEEN.

The corresponding lecture notes are in Chapter 11 (see link below). You should probably work through the notes in addition to listening to the lecture as the latter focuses on the ideas rather than the detailed calculations. (The material is also explained in many of the books on the literature list, e.g., Altland/Simons, Wen, Negele/Orland etc.). The lecture and the lecture notes contain parts on the Green function of free bosons (Sec. 11.5. in the notes). You can skip these because I did not manage to introduce Green functions (and Matsubara frequencies) yet.

Please note the following rearrangements:

Friday June 2: lecture (no tutorial)

Monday June 5: tutorial (no lecture)

Thursday June 8: prerecorded lecture

(The Friday tutorial on June 9 will take place as usual.)


Lectures will be held Mo 10-12 and Th 10-12 (Hörsaal B).

In addition, there will be tutorials Fr 10-12 (starting April 28; Seminar room 1.4.31).

Problem sets will be made available online on Thursdays and have to be turned in by the following Thursday BEFORE the beginning of class.

General information

Problem sets

example problem set and solution

set 1       solution

set 2       solution

set 3       solution

set 4       solution

set 5       solution

set 6       solution see updated notes on bosonization (Chapter 7)

set 7       solution

Lecture notes

Chapter 1: Second quantization

Chapter 2: Free bosons, free fermions, and 1D XY spins

Chapter 3: Interacting bosons

Chapter 4: Excitonic insulators

Chapter 5: BCS theory of superconductivity

Chapter 6: Quantum Ising model

Chapter 7: Bosonization

Chapter 8: Charge-flux attachment

Chapter 9: Path integrals

Chapter 10: Linear response and correlation functions

Chapter 11: Boson functional integral